Old aquarium that has been dosed with copper before

[Willu]

I have a few old aquariums that probably haven't been used for maybe 7-8 years, and I'm fairly certain that copper has been dosed in them. If I wanted to use them, would the copper be an issue if I completely reseal?
Thanks!

 

[40g Nano]

use vinegar to clean it and cuprisorb in the tank to remove and more that may leach in